S: World War 2
1: The main reason the United States joined the war was because of Japan's attack on Pearl Harbor.
2: The official dates for the World war 2 were 1939 to 1945.
3: World War 2 began in 1939 when Britain and France declared war on Germany because Germany invaded Poland. Also because Germany was not very happy about the Treaty of Versailles. And Japan was hit very hard by the great depression and that affected them.
4: The United States, Britain, Japan, Germany and Russia were the main countries involved.
5: There were many weapons including handguns, rifles, machine guns, submachine guns, tanks and armored vehicles.
6: Rosie the Riveter was created as a role model to encourage woman on the home front to help with the war effort.
7: The production of war weapons put many people back to work. Also the government employed millions of people who served in the military.